curdle

verb

1. To form curds so that it no longer flows smoothly; to cause to form such curds. (usually said of milk)“Too much lemon will curdle the milk in your tea.”
2. To clot or coagulate; to cause to congeal, such as through cold. (metaphorically of blood)
3. To cause a liquid to spoil and form clumps so that it no longer flows smoothly